<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>js入门</title>
</head>
<body>
    <!-- <input type="button" value="点我" onclick="alert('我是个按钮')"> -->
    <!-- <script>alert('hello world!')</script> -->
    <!-- <script src="./index,js">
    // 我是单行注释
    /*多行注释*/
    
    </script>    -->
    <!-- <script src="./index.js" defer="defer"></script> -->
    <!-- <script>
        var a = prompt("请输入你的年龄");
        console.log(a);
    </script> -->
    <script>
        alert("我是窗口的弹框");
        console.log("控制台的内容一般人看不到");
    </script>

</body>
</html>